While this is a 737-900, it felt more like a 737-200 (outdated earlier 737, showing age, cramped). The 900 is supposed to be a stretched 737 with revamped lighting and a better cabin, but I had better times in southwest’s 737-300s.
https://www.seatguru.com/airlines/United_Airlines/United_Airlines_Boeing_737-900_A.php